chore: remove documate dependencies

[chenjiahan]

Summary

Remove documate dependencies. Documate is no longer used by our website, and it seems like the packages are no longer maintained.

https://github.com/aircodelabs/documate

close https://github.com/web-infra-dev/rspress/pull/792

Checklist

• [ ] Tests updated (or not required).
• [ ] Documentation updated (or not required).

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